| Don Williams | |
| Position: | Pitcher |
| Birth Date: | 14 September 1931 |
| Birth Place: | Floyd, Virginia |
| Death Place: | Floyd, Virginia |
| Bats: | Right |
| Throws: | Right |
| Debutleague: | MLB |
| Debutdate: | September 12 |
| Debutyear: | 1958 |
| Debutteam: | Pittsburgh Pirates |
| Finalleague: | MLB |
| Finaldate: | August 23 |
| Finalyear: | 1962 |
| Finalteam: | Kansas City Athletics |
| Statleague: | MLB |
| Stat1label: | Win–loss record |
| Stat1value: | 0–0 |
| Stat2label: | Earned run average |
| Stat2value: | 7.20 |
| Stat3label: | Strikeouts |
| Stat3value: | 7 |
| Teams: | |
Donald Fred Williams (September 14, 1931 – October 16, 2011) was an American professional baseball pitcher. He played in Major League Baseball (MLB) for the Pittsburgh Pirates and Kansas City Athletics. He was signed by the Pirates with his twin brother, Dewey "Ted" Williams, who pitched several years in the minors.
Williams pitched in parts of three seasons for the Pirates and Athletics (1958, 1959, and 1962) making 11 relief appearances for a 7.20 career earned run average in 20 innings, and did not record a decision. His lone hit in four at-bats was a triple. Prior to that, he pitched for the University of Tennessee and nine seasons in the minor leagues.